triphthongal
adjective/trɪfˈθɒŋɡl/, /trɪpˈθɒŋɡl/
/trɪfˈθɔːŋɡl/, /trɪpˈθɔːŋɡl/
(phonetics)- combining three vowel sounds or vowel letters, for example the sounds /aɪə/ in fire /faɪə(r)/ compare diphthongal, monophthongal
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triphthongal